Bump Newtonsoft.Json in /samples/ChangeFeedMigrationTool

Bumps [Newtonsoft.Json](https://github.com/JamesNK/Newtonsoft.Json) from 10.0.3 to 13.0.2.
- [Release notes](https://github.com/JamesNK/Newtonsoft.Json/releases)
- [Commits](https://github.com/JamesNK/Newtonsoft.Json/compare/10.0.3...13.0.2)

---
updated-dependencies:
- dependency-name: Newtonsoft.Json
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

samples/ChangeFeedMigrationTool/packages.config

@@ -2,5 +2,5 @@
 <packages>
   <package id="Microsoft.Azure.DocumentDB" version="1.17.0" targetFramework="net47" />
   <package id="Microsoft.Azure.DocumentDB.ChangeFeedProcessor" version="1.1.0" targetFramework="net47" />
-  <package id="Newtonsoft.Json" version="10.0.3" targetFramework="net47" />
+  <package id="Newtonsoft.Json" version="13.0.2" targetFramework="net47" />
 </packages>